needhelp73 needhelp73

26-02-2017
Mathematics

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Sin(13pi/2) in periodic function

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MannyJ01 MannyJ01

26-02-2017

answer: 1
13pi/2 can be simplified onto 6 pi/2, so it goes around the unit circle 6 times and left with pi/2. the coordinates of pi/2 is (0,1). the trigonometric function sin is y/r. since r is always 1 on the unit circle, the answer is the y value, in this case it is 1.

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